Every Dragon aspect has glowing eyes, but when they lost their immortality with the defeat of Deathwing, they lost this glow. We only saw Nozdormu's true eye color after this event. Also, he most likely had blue eyes in-game because he took on the form of a High elf.

basically noz in game does have a night elf model, with belf skin, like how ysera has a belf body with nelf coloring and sylvies pants/ alex's cloak. I'm not even really sure wth is up with Kalec. His model is just.. weird. Of course his appearances in the comic weren't all that smattered with appropriate amounts of chromosomes.

In comparison to other aspects, he's just a slightly taller human male with different voice actor though, like every other aspect has this shiny special model, and there we have Kalec. But either way, props to Blizz for giving Nozdormu a model, both dragon and human.